--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/third_party/emsdk/test/test_source_env.sh	Thu Jan 22 21:23:17 2026 -0800
@@ -0,0 +1,132 @@
+#!/usr/bin/env bash
+
+echo "Test ability to source emsdk_env.sh in different shells"
+
+if [ -n "$EMSDK" ]; then
+    echo "EMSDK is already defined in this shell. Run tests in a shell without sourcing emsdk_env.sh first"
+    exit 1
+fi
+
+DIR=$(dirname "$BASH_SOURCE")
+
+# setup a symlink relative to the current dir
+REL_LINK_DIR="$DIR/tmp"
+if [ -d "$REL_LINK_DIR" ]; then
+    rm -rf "$REL_LINK_DIR"
+fi
+echo "Creating links in $REL_LINK_DIR"
+mkdir -p "$REL_LINK_DIR"
+(cd $DIR/.. && ln -s `pwd` "$REL_LINK_DIR/emsdk")
+(cd $DIR/.. && ln -s `pwd`/emsdk_env.sh "$REL_LINK_DIR")
+
+# setup a symlink in an absolute directory
+ABS_LINK_DIR="/tmp/emsdk_env_test"
+if [ -d "$ABS_LINK_DIR" ]; then
+    rm -rf "$ABS_LINK_DIR"
+fi
+echo "Creating links in $ABS_LINK_DIR"
+mkdir -p "$ABS_LINK_DIR"
+(cd $DIR/.. && ln -s `pwd` "$ABS_LINK_DIR/emsdk")
+(cd $DIR/.. && ln -s `pwd`/emsdk_env.sh "$ABS_LINK_DIR")
+
+PATH1="$DIR/../emsdk_env.sh"
+PATH2="$REL_LINK_DIR/emsdk/emsdk_env.sh"
+PATH3="$REL_LINK_DIR/emsdk_env.sh"
+PATH4="$ABS_LINK_DIR/emsdk/emsdk_env.sh"
+PATH5="$ABS_LINK_DIR/emsdk_env.sh"
+
+assert_emcc() {
+    current=$1
+    cmd=$2
+    value=$3
+    if [ -z "$value" ] || [ "$value" == "false" ]; then
+        echo "FAILED:  $current"
+        echo "  unable to get EMSDK in $current using '$cmd'"
+    else
+        echo "SUCCESS: $current testing $cmd"
+        echo "  -> EMSDK = $value"
+    fi
+}
+
+test_bash() {
+    value=$(bash --rcfile <(echo $1))
+    assert_emcc bash "$1" "$value"
+}
+
+test_zsh() {
+    value=$(zsh -d -c "$1")
+    assert_emcc zsh "$1" "$value"
+}
+
+test_ksh() {
+    value=$(ksh -c "$1")
+    assert_emcc ksh "$1" "$value"
+}
+
+it_tests_direct_path() {
+    TEST_SCRIPT=". ${PATH1}"' >/dev/null 2>&1; if [ -n "$EMSDK" ]; then echo "$EMSDK"; else echo false; fi ; exit'
+    test_bash "$TEST_SCRIPT"
+    test_zsh "$TEST_SCRIPT"
+    test_ksh "$TEST_SCRIPT"
+    TEST_SCRIPT="source ${PATH1}"' >/dev/null 2>&1; if [ -n "$EMSDK" ]; then echo "$EMSDK"; else echo false; fi ; exit'
+    test_bash "$TEST_SCRIPT"
+    test_zsh "$TEST_SCRIPT"
+    test_ksh "$TEST_SCRIPT"
+}
+
+it_tests_via_relative_dir_symlink() {
+    TEST_SCRIPT=". ${PATH2}"' >/dev/null 2>&1; if [ -n "$EMSDK" ]; then echo "$EMSDK"; else echo false; fi ; exit'
+    test_bash "$TEST_SCRIPT"
+    test_zsh "$TEST_SCRIPT"
+    test_ksh "$TEST_SCRIPT"
+    TEST_SCRIPT="source ${PATH2}"' >/dev/null 2>&1; if [ -n "$EMSDK" ]; then echo "$EMSDK"; else echo false; fi ; exit'
+    test_bash "$TEST_SCRIPT"
+    test_zsh "$TEST_SCRIPT"
+    test_ksh "$TEST_SCRIPT"
+}
+
+it_tests_via_relative_file_symlink() {
+    TEST_SCRIPT=". ${PATH3}"' >/dev/null 2>&1; if [ -n "$EMSDK" ]; then echo "$EMSDK"; else echo false; fi ; exit'
+    test_bash "$TEST_SCRIPT"
+    test_zsh "$TEST_SCRIPT"
+    test_ksh "$TEST_SCRIPT"
+    TEST_SCRIPT="source ${PATH3}"' >/dev/null 2>&1; if [ -n "$EMSDK" ]; then echo "$EMSDK"; else echo false; fi ; exit'
+    test_bash "$TEST_SCRIPT"
+    test_zsh "$TEST_SCRIPT"
+    test_ksh "$TEST_SCRIPT"
+}
+
+it_tests_via_absolute_dir_symlink() {
+    TEST_SCRIPT=". ${PATH4}"' >/dev/null 2>&1; if [ -n "$EMSDK" ]; then echo "$EMSDK"; else echo false; fi ; exit'
+    test_bash "$TEST_SCRIPT"
+    test_zsh "$TEST_SCRIPT"
+    test_ksh "$TEST_SCRIPT"
+    TEST_SCRIPT="source ${PATH4}"' >/dev/null 2>&1; if [ -n "$EMSDK" ]; then echo "$EMSDK"; else echo false; fi ; exit'
+    test_bash "$TEST_SCRIPT"
+    test_zsh "$TEST_SCRIPT"
+    test_ksh "$TEST_SCRIPT"
+}
+
+it_tests_via_absolute_file_symlink() {
+    TEST_SCRIPT=". ${PATH5}"' >/dev/null 2>&1; if [ -n "$EMSDK" ]; then echo "$EMSDK"; else echo false; fi ; exit'
+    test_bash "$TEST_SCRIPT"
+    test_zsh "$TEST_SCRIPT"
+    test_ksh "$TEST_SCRIPT"
+    TEST_SCRIPT="source ${PATH5}"' >/dev/null 2>&1; if [ -n "$EMSDK" ]; then echo "$EMSDK"; else echo false; fi ; exit'
+    test_bash "$TEST_SCRIPT"
+    test_zsh "$TEST_SCRIPT"
+    test_ksh "$TEST_SCRIPT"
+}
+
+run_bash_tests() {
+    it_tests_direct_path
+    it_tests_via_relative_dir_symlink
+    it_tests_via_relative_file_symlink
+    it_tests_via_absolute_dir_symlink
+    it_tests_via_absolute_file_symlink
+}
+
+run_bash_tests
+
+rm -rf $REL_LINK_DIR
+rm -rf $ABS_LINK_DIR